Home / mailings [SECURITY] [DSA 6573-1] firefox-esr security update
Posted on 21 October 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6573-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
October 21, 2026 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2026-113470
This update blocks compromised intermediate certificates issued by the
eMudhra CA.
Most users will have these certs already blocked by the OneCRL feature
provided by Firefox. This update blocks the certificates also for
installations which have RemoteSettings disabled or which are unable to
connect to the revocation backend service due to network constraints.
For the stable distribution (trixie), this problem has been fixed in
version 153.5.1esr-1~deb13u1.
We recommend that you upgrade your firefox-esr packages.
For the detailed security status of firefox-esr please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/firefox-esr
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
